Activation of alpha receptors on the radial muscle a. causes pinpoint pupils b.
ID: 78724 • Letter: A
Question
Activation of alpha receptors on the radial muscle a. causes pinpoint pupils b. induces miosis c. increases the amount of light that enters the eye d. causes the eyes to converge e. causes ptosis of the lid Which of the following can also be called the "near response" (adaptation for near vision) ? a. photopupillary reflex b. ptosis of the lid c. accommodation response d. corneal reflex e. fixed and dilated A wisp of cotton over the surface of the cornea tests the function of the ___ nerves. a. Oculomotor and trigeminal b. CN II and CN III c. Optic and oculomotor d. trochlear and abducens e. trigeminal and facial The eyes converge a. with sympathetic nerve stimulation b. during the "fight or flight response" c. as part of the accommodation response d. as a response to increased intracranial pressure c. in response to eyedrops containing atropine, a muscarinic blockerExplanation / Answer
Q12. c. increases the amount of the light that enters the eye
Activation of alpha1 receptors present in the radial muscle of the iris causes the dialation of iris, causing more light to reach the eye in the flight or fight situation.
Q13. c. Accomodation response
Accomoation response is a reflex action of eye. When eye moves from a distant object to a near object the eye gets converged. This is called the near response or adaptation for seeing near objects,
Q14. e. Trigeminal and facial
The corneal reflex or the blinking reflex of the eye is mediated by the ophthalmic branch (V1) of the 5th cranial nerve (trigeminal nerve) and the facial nerve. T test this reflex th ecotton wool experiment is done. This reflex is hepful in protecting the eye from foreign stimulus and bright light.
Q15. c. as part of the accomodation response
In accomodation response the eye tries to see a near object and for that the two eyes rotates towards each other. This is called convergence.
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